Parts such as the Oil Pump: Screw,cross 6x35, Strainer Assy,oil, Switch,oil, Screen,strainer are included in the Cb500k1 Four 1972 Usa Oil Pump parts fiche.
The lowest price component in this Oil Pump parts-list fiche is the Bolt,hex 4x6.
The Honda OIL PUMP has twenty-two products enlisted in the schematic.